docs: def immutable_task(task, state, pre_state, created):
      """Converts to an immutable slots class to handle internally."""
      # noinspection PyUnresolvedReferences,PyProtectedMember
      return TaskData._make(chain(
          (getattr(task, f) for f in TASK_OWN_FIELDS),
          (state, pre_state, created),
      ))